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Summer's Dawn Micaiah x2, what to do?
So, I pulled 2 Summer's Dawn Micaiahs about a month ago, and I kept both for now. The first one is +ATK -HP, and the second one is +ATK -Res. I gave the first one an Earth blessing, Luna (no Moonbow fodder unfortunately), and WoM3. The second one has default kit.
What should I do with them? Should I merge one into the other (if so, which should be the main one)? Or would it be better to build them separately for different purposes? I'm aware that the +ATK -Res one will score slightly higher in arena due to HP being a superbane, but I don't really plan on using her in arena unless she's the bonus unit. She's mostly for arena assault and PvE content.

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